Defending champion Usain Bolt burst out of crowded field to capture his second consecutive Olympic title in the 100m sprint in 9.63 seconds, with teammate Yohan Blake in 2nd and Justin Gatlin in 3rd
David J. Phillip/Associated PressJamaica's Usain Bolt crosses the finish line in a men's 100-meter semifinal during the athletics in the Olympic Stadium.
Emilio Morenatti/Associated PressJamaica supporters react as they watch a broadcast of the women's 400-meter hurdles on a screen at the Puma Yard in London.
Associated PressBritain's Dwain Chambers, left, and Jamaica's Usain Bolt compete in a men's 100-meter semifinal during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Sunday, Aug.
Matt Slocum/Associated PressJamaica's Usain Bolt, center, wins his men's 100m semifinals heat during the athletics in the Olympic Stadium at the 2012 Summer Olympics.
Britain's Prince William, left, his wife Catherine, the Duchess of Cambridge, and Britain's Prince Harry, right, applaud as they watch athletics.